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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a3cc48b85bbce64eb29d436ff9952c71c5557a47d4b8590158f7f5500a7f38' 
  AND token = 'SAQi541v7u/aPhLBu8rIqBItUh1LnwCx3bnpffHuBQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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