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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17baccdece13a2703235c97bbdbae0b0ba2d70a4e8d3f8f9acde24d5731afc6' 
  AND token = '6kpu5QSmyPr/zUgPSKL2gqPTyUGH51y+1vZzPZuROCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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