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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b647d240e8f50570b4a83356354989f3d3851f60303fdf7d5a48c091b39b167a' 
  AND token = 'mL0KuoI4mcEUS+kqjJhcLj4ubXfPoL20OmaCFtNSmrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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