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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176204e51bcc2333338c26342b02c98043a0fc2f44bf1bb6f5449250d2276afb' 
  AND token = '7glir9caxMuejHPK/mCeggV/ZAkHYJ0V5sFP4HObmaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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