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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c234e9f268df9646b213e34884a7ef6e358dc97ad605160fa6e8ac1d33667ca' 
  AND token = 'F4qR0uF4RMH5weskGgDIpc9Bl5EXMXPsWIX3Ls/L7P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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