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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b72d9e2ae0b6b4914cec87a147d4decbe7962adbe7c7c7748450bf016fa7ad8c' 
  AND token = 'wEL0zlHeK9GdJPTcAQTwRIy9nKKNdVuOJDLqdQt75N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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