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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832232cb32a25008d95d49ede24da08b9f3d50ec3aa9051d63a6a0952e631964' 
  AND token = 'RXzWrQTGxneLODWKrlcE2OW3LX4uOmXz0PjG0AsegPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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