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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b96115639f3d1273bc0e1f921cd0f656abe77a0a48bafe711253f78d2253795e' 
  AND token = '7wwKG7xa6YCNrYfcO4PHh8Z4V1E9qc07AAcGVY7jOFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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