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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c68fd4cfbbfb924e2e1e69ba006b3fbb9adfd7dd87b47c73eef05016d5cc57c' 
  AND token = 'g2AUSkx5T1wds8ZNn/F0e2vYuBYvFSRkU5OpEwItVus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}