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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2b122f1b3f141d87079ed45b5b80631b597a32af1fc90354ffb3143bfaad9b' 
  AND token = 'nOLIZUdlEWwvSdhjpjh0mLYzzD4mnWQMosdgselQQm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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