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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbee38f4ebd8c247f6906ae1c9cf254ea08c0104e4b804da393af6e807ba917a' 
  AND token = 'rVoN37Nlhixb/vhOTDkIycDRK5AAW23b9f61d+qy/Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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