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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d4d1d9951d2d0550cc5dc0748eda935adcf471351c4d31ebcd0f61ea70e9f6' 
  AND token = 'iliCE2RN/hUAMqc1Kg4LgSVWl0lNaTwmumL0+Ki8Vy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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