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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '142b84b606227eb5553940aec9151a7340dc5a62427cdad42dc5064f4c4479d1' 
  AND token = '8oy+fMH45SHKbBSSFmtePlJU12HtKjYwb8vokGMqKMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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