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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8e79edb1178c77d17a9f6cd110f82654fd5746c97dbbf0f460d83ef2d7cb87f' 
  AND token = 'fosppdhuubsxwmvvtttGaCpk8v579xbFrhcGsFYSkBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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