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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a58200384bf2ed11869138acd9a4ebd66a17794e56d388cdfb23bf2762797c' 
  AND token = 'oRakpup03n1VgCspG3aYdXvx0+4Ob83RliARRRoEoZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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