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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a45f90315aaa721216a4bb6e50a2e7306ac9dc62c07ecfa3c2a0e24fc444975c' 
  AND token = 'uBQn7KAlbwbtHO/ViZy6hqWi0dEqoQsA7PnDweeStP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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