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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8eb74eec82ea70f27ad88bd42ce082a913993f6e60921b5d928dd0c8635cea' 
  AND token = 'U/DsjM0A70CtN+RBiJ6TC8i81KR0xIGYiFmQ0O0LByc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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