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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd4fba6bf187f5c003eced19b2d00a83cde82314c8504ff921f8ab93ad428b8a' 
  AND token = 'gX0KL79vftKekQGqcI/IbRGfoz4e5dw8imD2qkAiDTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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