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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe0354bf73743794974308f874e718483aebd65ee83e1f8d6abb2eb3b7329db' 
  AND token = 'Bm0wXlQuU9XI2ppVAX2+AyleWz8pULcLXWca2MHJ+Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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