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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd77ae9dc67c05206bf07eac36432f4b29a42ad3845f8f6f2c606269278a12ed' 
  AND token = 'csygNwRQaLrPUy1et/qNWr1rgAc//SWm7ZYnyICBnhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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