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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd5036c6dcb7667b44942a7aed7cb691a760e7f1f815361f637012dcaee39e7' 
  AND token = 'eu6b0F1ZhrSY2WWIVLDgLLiHCtGM8Kx0bXNIb9RXeBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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