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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dec320aa298d1d853a5e82c04f807028a472c44cc1e646474c00dd6450de480' 
  AND token = 'fy9YkPmpvhDOExJNu5dYBDnoYGseM9SSgo/i683XS1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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