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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e86f38548381967dadfb55fae6c6143c024ef9c999e9c44e4e9ef2df6f9a4faf' 
  AND token = 'NndDP7r8v38KrzHhqItY6K8hl2GD0lLzSqNJIMwyz5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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