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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51cb81e958fbfc7b037cdb1065ad2a97484e5b3ae597fe2f4d4b20a03f4fad0f' 
  AND token = 'b4LKdZgecxXVHa0ta45WBx4Y5qQX/SG21OLvvKnq5dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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