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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e0514d4f1b1c0f4551e5a37116bebaa26822dbf2ce4750756702f90bc6abca1' 
  AND token = 'xkfHN0YYC9MCinUFSdqvHNQ+L/tthR7206xD9enXE0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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