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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '073cecc0332d1f08588b2fc840794f0d1dd68eda17e515793040f514618d12f9' 
  AND token = 'UgRuo7WTr/heBKg4OX1tb6qh5yyoPuyq9ijfSNEd1N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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