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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e6ad8c732a00ea67c00cf5e86da205c0c061adcbc7875ffdb79887e685f7199' 
  AND token = '1baZADQKO05qDz7PR+9z9TARDebo2WSvaWfLsm6NI+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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