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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03fff4d355e6ef73c8607fbd10976331f0135af4f17a973e5b9c4fe526f578d3' 
  AND token = 'ujVWq88zRObDTF1t2FOCi98E+nNdoAq8EAmkp1seWqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00112

JSON explain

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