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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda5d4f4a5143d9aefa73c0aac4360a7862a68390344f312c78cb9847e723299' 
  AND token = '+v7VqOFTVCPFOZD8O9AVb2ofAje540rydHJ6cq3JgA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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