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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae3910ef74e3d9a62ee6d89ab963f2dfdf322b23e951affaeb389b58a3beab2' 
  AND token = '7HPfglMrxZeYp7HYEys3r24l8uPxr/GdKq2txgfVpxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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