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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88f9790504721515da407a400aab440ad3fba84ca8cd570ef429e3d782d16fef' 
  AND token = 'so4gHw/17jAWjipKD51V7UiPziAh0ISZCFmw5Zhi//M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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