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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba273b466c685cbd2254dcd044322840b7c778ae0b77b7746c9652ee8501067' 
  AND token = 'q9JDlsk9bLpaxpQElNpGbcNoOkAFbOKyF9AjTipKD6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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