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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '741e2dbc45c1198ca38d01da7c9f3de3bacddf9326741122557963bde2cd3cea' 
  AND token = '0dR4dG0QYSJQ4DPeykPWLGWBgSxuhWI8r4klyMo7rMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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