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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58acd0891b22cadaba449433dcf75eaa1d914d63d3fe5a456b3b62ff8103b91' 
  AND token = 'xLrDfieCQ7s5B2NUNzrhloJW9QS33ki14wq4QFKefMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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