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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd09791d2a99da3ad70b5735b6c41be780e21a243e1e69f53c5c4fa6c7d881663' 
  AND token = 'GMwAcOCwM2e59YGti53c9CUcVIe6Z8mZ7JtKQhlZDMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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