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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce0d40b13833e7cde9ede5d59e5cd8b55d324220641aa55a4505db6b8968c096' 
  AND token = 'nNFmw4SPFnsjzvkmbPdjsEbW6WkVy69O0p+PNat7buc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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