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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c84871c5181b019fa499057841da4e1553e273dad6f962f0cd45aeac8f74b9a' 
  AND token = 'nQo7SI9FoYplNE+PIXNM6MctmjVDpTJU5Sr1Tdot2+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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