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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552dd8ba06850e4f1886f6263a6db610048bbd0767909aa0f4742bb1811f3988' 
  AND token = 'oyvBSix/517Qcy64rEv59RzkLX7xGPNDTn1Ab7gRZCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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