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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '508f8ecbc0859ab98c0c0c6f45d4b57984170b698da93397a6bd502840b11e8e' 
  AND token = 'a4fZJdOhzUjlYsfc52OjUjNhPb+yyLELDVCrFc1kPPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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