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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cabb551bae6b961e4ae6692f8577b68eacc6c73c95f1ec120dabe5f2ed759fc' 
  AND token = 'RJnbIK1cZs/Fl2Vfo9K1REaGpS0G0OqexeVlzOe7LfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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