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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee5807bea2d7ad741302084885e61a6d285e4b5d7695101b1dd86dd68c8a74e' 
  AND token = 'w+9/SUAwUWnuztd71WICodDpYvVnMFMDZ8hmbQzIuGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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