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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6473f89d568a6994ec9b43235e8d8518e7dc686796dc8b53341a94eb5a2b207e' 
  AND token = '8B+FQS1429Jb8yGgA79vT/9rmK+nOI45hcvQ1vB+Ffc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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