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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f04368cb5484256bf1e6a6350db59bacea4f5d2be7ec5c51a83c42af5d62080f' 
  AND token = 'SpALzC95eirLUkO+qIvH96mooI6czBQPW/hds+8btWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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