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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5874352820b37af9f19b16b61ee5ad7cc41d6af9b2b6f8f94236981d7a008a67' 
  AND token = 'iTc8Rva5nt95dL5r+n+4hpNtHOeyfLNlyAtxgPb1XGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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