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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b77c65152f148c19c08bb21f3c88da421a1746d1c2dfa20a613c44efc8ea74' 
  AND token = 'gWhRdHXfp9HTtBf9JuOrRxlZT65vnubk/pWikhxf73M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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