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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '978bcd98ab3ad336d3ad57c65e3da8c4b9c1d6ccde658c4af4ff596b8a44c132' 
  AND token = 'KFe++dW5o4m6IdMvq/ZH3D50circN/RlzwhXwu5etLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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