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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3812dbfd89ea6f54280a3e3329afbc213c6de5a1b3979bd28a0fafd2b442f5c0' 
  AND token = 'poYYd1xU4xXdk1Dg11TS209MjIbjdli1K6FyNY5DcWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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