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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '538fda6b5fc367e4dfda3238706cbd7d4d3b826786c0e5eec487105324941119' 
  AND token = '5sJYkHTgfQrusow+e74rCYW1tha+IwL9e1VdaoTLcys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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