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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d8df3a1c1268145d7bd7372c993e9b9b958b613ed4ee2e2dc6d668745e41d83' 
  AND token = 'nXH72P5DpnIkWZBnXR2mhqcBI4DDj1OENj7b2GD2EyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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